24 



more strongly rounded and more narrowly margined sides. The 

 head is a little narrower and more elongate than that of 

 S. discopunctatus, and the seventh and eighth elytral striie are 

 much more distinct, though considerably fainter than the rest of 

 the striiB. The punctures of the basal ventral segment are very 

 well defined. 



Eiverard Range. 



PLATYXUS. 



P. marginicollis, Macl. Nilpena ; also Everard Range. 

 DYTISCIDyE. 



BIDESSTJS. 



B. higtrigatwt, Clk. Most of the examples of this species differ 

 from the type in having the fuscous markings on the elytra 

 very sharply defined — consisting of two blotches placed one 

 behind the other on the apical half of each elytron. In one 

 example the two are united on eacli elytron into a single 

 large blotch, which is per'fectly black. 



ANTIPORUS. 



A. Gilberti, Clk. Upper Arkaringa. 



NKCTKKOSOMA. 



N. penicAllat'iis, Clk. Everard Range. 



LANCETES. 



L. lanceolaf/as, Clk. Boorabin. 



R][ANTUS. 



B. pulverosuti, Steph. Nilpena, Barrow Range, &c. 



COPELATUS. 



Upper Arkaringa. 



EEETES 



Boorabin. 



C. Hvidus, (Slip. 

 m. australis, Er. 



]I. nutans, ^lacl. 



/S'. (yyaneas, Fab. 



HYDROPHILIl).*:. 



JIYGEOTROPJIUS. 



Evei'ard Range. 



HISTERID.E. 



SAPRINUS 



Widely distributed. 

 NITIDULITXE. 



THALYCRODES. 



T. (TliaJyera) auKtralis, Germ. Mount Squires. 



